PreSonus R80 AMT Studio Monitor (Single) 2-way active AMT design provides articulate high-frequency response and wide stereo imaging Custom-designed, 6.8-inch, AMT ribbon tweeter responds to the subtlest waveforms and the highest frequencies 8-inch Kevlar LF drivers provide transparent mid- and low-frequency reproduction for clean sound and punchy bass Biamped, 150W Class D power amplifier with switching power supply. RF interference, output current limiting, over temperature, turn-on/off transient, and subsonic filter protection Acoustic Space settings (Linear, -1.5 dB, -3 dB, -6 dB) compensate for room placement RF interference, output current limiting, over temperature, turn-on/off transient, and subsonic filter protection